// JavaScript Document
function $(id)
{
	return document.getElementById(id)
}

$('popup_mask').style.width = document.body.clientWidth + 'px';
$('popup_mask').style.height = document.body.scrollHeight  + 'px';
$('popup_introdution').style.left = (document.body.clientWidth - 369)/2 + 'px';
$('popup_introdution').style.top = "100px";


function showIntro()
{
	$('popup_mask').style.display = "block";
	$('popup_introdution').style.display = "block";
}

function hiidenIntro()
{
	$('popup_mask').style.display = "none";
	$('popup_introdution').style.display = "none";
}